Patents by Inventor Tetsuchi Sakai

Tetsuchi Sakai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Bipolar transistor and method of manufacturing the same
    Patent number: 5049964
    Abstract: A bipolar transistor includes collector, base and emitter regions. The collector region consists of a first semiconductor region of a first conductivity type and formed in contact with a surface of a semiconductor layer. The base region consists of a second semiconductor region of a second conductivity type formed within the collector region to be in contact with the surface of the semiconductor layer. The emitter region consists of a third semiconductor region of the first conductivity type formed within the base region to be in contact with the surface of the semiconductor layer. The transistor also includes collector, base, and emitter electrodes. The collector and base electrodes are connected to the collector and base regions at opposite edges of a single opening formed in a field insulating film covering the surface of the semiconductor layer. The collector and base electrodes consist of a conductor. The emitter electrode is connected to the emitter region and consists of a conductor.
    Type: Grant
    Filed: March 22, 1990
    Date of Patent: September 17, 1991
    Assignee: Nippon Telegraph & Telephone Corp.
    Inventors: Tetsuchi Sakai, Yoshiji Kobayashi